The X-Frame-Options HTTP response header can be used to indicate whether or not a browser should be allowed to render a page in a
<iframe>. Sites can use this to avoid clickjacking attacks, by ensuring that their content is not embedded into other sites.
There are three possible values for X-Frame-Options:
In other words, if you specify
DENY, not only will attempts to load the page in a frame fail when loaded from other sites, attempts to do so will fail when loaded from the same site. On the other hand, if you specify
SAMEORIGIN, you can still use the page in a frame as long as the site including it in a frame is the same as the one serving the page.
To configure Apache to send the X-Frame-Options header for all pages, add this to your site's configuration:
Header always append X-Frame-Options SAMEORIGIN
To configure nginx to send the X-Frame-Options header, add this either to your http, server or location configuration:
When an attempt is made to load content into a frame, and permission is denied by the X-Frame-Options header, Firefox currently renders about:blank into the frame. At some point, an error message of some kind will be displayed in the frame instead.
|Feature||Chrome||Firefox (Gecko)||Internet Explorer||Opera||
|Basic support||18.104.22.1682||3.6.9 (22.214.171.124)||8.0||10.5||4.0|
|ALLOW-FROM support||Not supported||18.0 (18.0) bug 690168||8.0||Not supported||WebKit bug 94836|